為了提高軟體下載速度，減少下載失敗的問題，將源更換為國內源。

CTRL+ALT+T    開啟終端

su root + Enter 輸入密碼，將當前使用者更換為root最高許可權

sudo gedit /etc/apt/sources.list 視窗開啟原始檔

將下列貼上到sources.list的最上方

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
 

使檔案生效

sudo apt-get update
sudo apt-get upgrade

將Ubuntu系統改為中文

點選介面右上角倒三角下拉，選擇扳手圖示

然後在settings對話方塊依次點選點【Region & Language】-【Manage Installed Languages】

在彈出的視窗再點選【install】設定操作，需要下載語言包，安裝Ubuntu語言必須聯網

完成設定後點擊【install/remove language】，在彈出的視窗找到【漢語(中國)】，最後點選【apply change】，然後等待下載。下載完成後選項裡已經有了中文選項。然後找到【漢語(中國)】，按住【漢語(中國)】，拖動到最上方。

https://blog.csdn.net/FX677588/article/details/53096702

更改Ubuntu解析度

https://blog.csdn.net/u013122625/article/details/52967831